package demo2;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: GaoBo
 * Date: 2021-05-16
 * Time: 9:50
 */
class A {

}
class B extends A{

}
class C extends B {

}
final class D extends C {

}
class Student {

}
class Teacher {

}

class School {
    public Student[] students;

    public Teacher[] teachers;
}
public class TestDemo2 {
    protected  int val;
}
